Adds isValidProperty util function (#38)

* Adds util module and first isValidProperty function

Author: tylergaw

lib/util.js

@@ -0,0 +1,113 @@
+/**
+ * @param {string} propertyName
+ * @returns {boolean}
+ */
+export function isValidProperty(propertyName) {
+  return cssProperties.includes(propertyName);
+}
+
+const cssProperties = [
+  "align-content",
+  "align-items",
+  "align-self",
+  "animation",
+  "animation-delay",
+  "animation-direction",
+  "animation-duration",
+  "animation-fill-mode",
+  "animation-iteration-count",
+  "animation-name",
+  "animation-play-state",
+  "animation-timing-function",
+  "background",
+  "background-attachment",
+  "background-color",
+  "background-image",
+  "background-position",
+  "background-repeat",
+  "background-size",
+  "border",
+  "border-collapse",
+  "border-spacing",
+  "box-shadow",
+  "box-sizing",
+  "caption-side",
+  "clear",
+  "clip",
+  "color",
+  "contain",
+  "cursor",
+  "display",
+  "empty-cells",
+  "filter",
+  "flex",
+  "flex-basis",
+  "flex-direction",
+  "flex-flow",
+  "flex-grow",
+  "flex-shrink",
+  "flex-wrap",
+  "float",
+  "font-family",
+  "font-size",
+  "font-style",
+  "font-weight",
+  "grid",
+  "grid-area",
+  "grid-auto-columns",
+  "grid-auto-flow",
+  "grid-auto-rows",
+  "grid-column",
+  "grid-column-gap",
+  "grid-gap",
+  "grid-row",
+  "grid-row-gap",
+  "grid-template",
+  "grid-template-areas",
+  "grid-template-columns",
+  "grid-template-rows",
+  "height",
+  "justify-content",
+  "left",
+  "letter-spacing",
+  "line-height",
+  "list-style",
+  "list-style-image",
+  "list-style-position",
+  "list-style-type",
+  "margin",
+  "mask",
+  "object-fit",
+  "object-position",
+  "opacity",
+  "outline",
+  "overflow",
+  "padding",
+  "pointer-events",
+  "position",
+  "resize",
+  "right",
+  "table-layout",
+  "text-align",
+  "text-decoration",
+  "text-indent",
+  "text-overflow",
+  "text-shadow",
+  "text-transform",
+  "top",
+  "transition",
+  "transition-delay",
+  "transition-duration",
+  "transition-property",
+  "transition-timing-function",
+  "user-select",
+  "vertical-align",
+  "visibility",
+  "white-space",
+  "width",
+  "will-change",
+  "word-break",
+  "word-spacing",
+  "word-wrap",
+  "z-index",
+];

lib/util.test.js

@@ -0,0 +1,17 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { isValidProperty } from "./util.js";
+
+describe("util module", () => {
+  describe("isValidProperty function", () => {
+    it("knows when properties are valid", () => {
+      assert.equal(isValidProperty("color"), true);
+      assert.equal(isValidProperty("animation-name"), true);
+    });
+
+    it("knows when properties are invalid", () => {
+      assert.equal(isValidProperty("horce"), false);
+      assert.equal(isValidProperty("dIsPlaY"), false);
+    });
+  });
+});